/*
    实现一个翻译服务器，客户端发送过来一个英语单词，返回一个汉语词语
*/
#include <muduo/net/TcpServer.h>
#include <muduo/net/EventLoop.h>
#include <muduo/net/TcpConnection.h>
#include <muduo/net/Buffer.h>

#include <iostream>
#include <string>
#include <unordered_map>
class DictServer
{
public:
    DictServer(int port)
        : _server(&_baseloop, 
        muduo::net::InetAddress("0.0.0.0", port), 
        "DictServer", 
        muduo::net::TcpServer::kReusePort)
    {
        // 用bind绑定成一个新的对象
        // 函数适配
        _server.setConnectionCallback(std::bind(&DictServer::onConnection, this, std::placeholders::_1));
        _server.setMessageCallback(std::bind(&DictServer::onMessage, this, 
            std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));
    }
    void Start()
    {
        _server.start();    // 先开始监听
        _baseloop.loop();   // 开始事件监控
    }
    ~DictServer()
    {
    }

private:
    void onConnection(const muduo::net::TcpConnectionPtr &conn)
    {
        if (conn->connected())
            std::cout << "连接建立！\n";
        else
            std::cout << "连接断开！\n";
    }
    void onMessage(const muduo::net::TcpConnectionPtr &conn, muduo::net::Buffer *buf, muduo::Timestamp)
    {
        static std::unordered_map<std::string, std::string> dict_map = {
            {"hello", "你好"},
            {"world", "世界"},
            {"bite", "比特"}
        };
        std::string msg = buf->retrieveAllAsString();
        std::string ret;
        auto it = dict_map.find(msg);
        if(it != dict_map.end())
            ret = it->second;
        else
            ret = "未知单词！";
        //  把结果返回过去
        conn->send(ret);
    }

private:
    // _baseloop必须放在_server上面，因为先有的baseloop
    muduo::net::EventLoop _baseloop;
    muduo::net::TcpServer _server;
};

int main()
{
    DictServer server(9090);
    server.Start();
    return 0;
}

// makefile里：-I 用于指定头文件所在路径